X0306 4 2020-09-09 0000768408 CYANOTECH CORP CYAN 0001201156 DAVIS MICHAEL A / CYANOTECH CORPORATION 73-4460 QUEEN KAAHUMANU HWY #102 KAILUA-KONA HI 96740 1 1 Cyanotech Corporation Common Stock 2020-09-09 4 P 0 1196 2.8441 A 19380 I By self as trustee for Nettizanne Johnstone Davis GST Exempt Trust Cyanotech Corporation Common Stock 2020-09-10 4 P 0 620 3 A 20000 I By self as trustee for Nettizanne Johnstone Davis GST Exempt Trust Cyanotech Corporation Common Stock 2020-09-09 4 P 0 622 2.8488 A 18916 I By self as trustee for Nyracai Johnstone Davis GST Exempt Trust Cyanotech Corporation Common Stock 2020-09-10 4 P 0 28 3 A 18944 I By self as trustee for Nyracai Johnstone Davis GST Exempt Trust Cyanotech Corporation Common Stock 12119 D Cyanotech Corporation Common Stock 31250 I By Spouse Cyanotech Corporation Common Stock 150000 I By self as co-trustee for the Nyracai Davis Irr. Trust and the Nettizanne J. Davis Irr. Trust Cyanotech Corporation Common Stock 477048 I By self as trustee of the Michael Arlen Davis Revocable Trust Cyanotech Corporation Common Stock 424621 I By self as director of Skywords Family Foundation Inc. The price reported is a weighted average price. These shares were bought in multiple transactions at prices ranging from $2.78 to $2.85, inclusive. The reporting person undertakes to provide to Cyanotech Corporation, any security holder of Cyanotech Corporation, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth in this footnote and footnote 2, 3 and 4. These shares were bought in multiple transactions at a price of $3.00. The price reported is a weighted average price. These shares were bought in multiple transactions at prices ranging from $2.79 to $2.85, inclusive. These shares were bought in multiple transactions at a price of $3.00. Skywords is a 501(c)(3) charitable foundation, of which the Reporting Person and his spouse serve as the two directors. The Reporting Person should not be deemed to be a beneficial owner of the shares held by Skywords under Rule 16a-2, however, the shares held by Skywords are included here for purposes of complete disclosure and in light of such shares having been previously disclosed on previous Forms 4 filed by the Reporting Person. /s/Laura L. Taylor, by Power of Attorney 2020-09-11